She became a widow at a young age.

Who is the main character?

He is an expert in hydrology, and his research is highly valued around the world.

He is an expert in hydrology and is conducting research on flood prevention.

Groundwater pollution has become a serious environmental problem.

The police used a water cannon against the demonstrators.

The police used a water cannon against the demonstrators.

This lake is known as a dangerous body of water.

He was admitted to a mental hospital after attempting suicide.

I have visited the Basque region in Spain.